A 20 year decline in solar photospheric magnetic fields: Inner-heliospheric signatures and possible implications

	A 20 year decline in solar photospheric magnetic fields: Inner-heliospheric signatures and possible implications
	Janardhan, P.1; Bisoi, Susanta Kumar 2; Ananthakrishnan, S.3; Tokumaru, M.4; Fujiki, K.4; Jose, L.5; Sridharan, R.5
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2015-07-01
卷号	120 期号:7 页码:5306-5317
关键词	Sun activity solar wind solar-terrestrial relations
英文摘要	We report observations of a steady 20year decline of solar photospheric fields at latitudes 45 degrees starting from approximate to 1995. This prolonged and continuing decline, combined with the fact that cycle 24 is already past its peak, implies that magnetic fields are likely to continue to decline until approximate to 2020, the expected minimum of the ongoing solar cycle 24. In addition, interplanetary scintillation observations of the inner heliosphere for the period 1983-2013 and in the distance range 0.2-0.8AU have also shown a similar and steady decline in solar wind microturbulence levels, in sync with the declining photospheric fields. Using the correlation between the polar field and heliospheric magnetic field (HMF) at solar minimum, we have estimated the value of the HMF in 2020 to be 3.9 (0.6) nT and a floor value of the HMF of approximate to 3.2 (0.4) nT. Given this floor value for the HMF, our analysis suggests that the estimated peak sunspot number for solar cycle 25 is likely to be 62 (12).
收录类别	SCI
语种	英语
WOS记录号	WOS:000360381400006
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5626]
专题	国家天文台_太阳物理研究部
作者单位	1.Phys Res Lab, Astron & Astrophys Div, Ahmadabad 380009, Gujarat, India 2.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China 3.Univ Pune, Dept Elect Sci, Pune, Maharashtra, India 4.Nagoya Univ, Solar Terr Environm Lab, Nagoya, Aichi 4648601, Japan 5.Phys Res Lab, Space & Atmospher Sci Div, Ahmadabad 380009, Gujarat, India
推荐引用方式 GB/T 7714	Janardhan, P.,Bisoi, Susanta Kumar,Ananthakrishnan, S.,et al. A 20 year decline in solar photospheric magnetic fields: Inner-heliospheric signatures and possible implications[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2015,120(7):5306-5317.
APA	Janardhan, P..,Bisoi, Susanta Kumar.,Ananthakrishnan, S..,Tokumaru, M..,Fujiki, K..,...&Sridharan, R..(2015).A 20 year decline in solar photospheric magnetic fields: Inner-heliospheric signatures and possible implications.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,120(7),5306-5317.
MLA	Janardhan, P.,et al."A 20 year decline in solar photospheric magnetic fields: Inner-heliospheric signatures and possible implications".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 120.7(2015):5306-5317.